Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb8136883e7a549…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 00:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0679a1af0cac8244aff4040fed72aae7 SHA-1: 5ce9464ef6d4a6abc26fe0b397e0bed8cf4d038d SHA-256: ddb8136883e7a549b0bd66f9b180cf413553128745d00e0e76289ed252817845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised WordPress sites, directing users to download files. The heuristic firings indicate a link farm on disposable hosting and a compromised CMS upload link, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=rainbow+6+siege+apk PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613618b02a1e8---dibofonus.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/nafodor.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/vawapi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ebd651af---81547483809.pdfIn PDF document text
    • http://dd-eng.com/files/files/domabi.pdfIn PDF document text
    • http://namngonviet.com/user-/files/9153577509.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/kajejezufinasifuzugozi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458fec965fc---jekovetapowapeme.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091021085073499.pdfIn PDF document text
    • http://goldmustang.ru/files/files/88991367300.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614279b6631e9---43028985180.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/vafunepogorujoresenefokew.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/16116491423.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/45815005691.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/1342109205.pdfIn PDF document text
    • https://pcetravel.com/files/file/29959164731.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/bokugidetamonaxafu.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/getuwupababejoripaduxa.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/bofegibexexi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b612ce3c79---86010833435.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/satatakurisu.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/69461720570.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613179110aa50---42772981027.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 10712 bytes
SHA-256: e100417f0dd4a9c67354b1bb44d308dcd02c74a2b86582f7d93547cc825b20a2
font_01_sfnt_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 18720 bytes
SHA-256: 6c3ee57825a438c3c4c66dce23ec386d7b824718db35aa1e7242d38a3c261656
font_02_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1